using System;
using System.IO;
using System.Reflection;
using ExamServer.Service;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.OpenApi.Models;
using Microsoft.EntityFrameworkCore;
using AutoMapper;

namespace ExamServer
{
  public class Startup
  {
    public Startup(IConfiguration configuration)
    {
      Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    //依赖注入:DI
    public void ConfigureServices(IServiceCollection services)
    {
      //依賴注入示例
      //services.AddSingleton<IMyDependency, MyDependency>(); //將IMyDependency依賴注入 Singleton 单例 服务从开启到结束，只创建一次的实例
      // services.AddScoped 范围内的，从客户端连接到服务上到客户端关闭，创建一次实例
      //services.AddTransient 暂时的，每次请求都会创建一次实例
      //注入跨域
      services.AddCors(options =>
      {
        options.AddPolicy("any", builder =>
        {
          builder.AllowAnyMethod()
                  .SetIsOriginAllowed(_ => true)//允许任何来源的主机访问
                  .AllowAnyHeader()
                  .AllowCredentials();//指定处理cookie
                });
      });
     //注入控制器
      services.AddControllers(options=>{
        options.AllowEmptyInputInBodyModelBinding=true;
      });
      //添加Swagger的服务
      services.AddSwaggerGen(options=>{
        options.SwaggerDoc("v1",new  OpenApiInfo{
          Title="ExamServer API",
          Version="V1",
          Description="ExamServer項目的API文档"
          });
          // Set the comments path for the Swagger JSON and UI.
        var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
        var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
        options.IncludeXmlComments(xmlPath);
      });
      //注入数据库操作上下文
      services.AddDbContext<ExamServerContext>(options=>{
        options.UseSqlite(Configuration.GetConnectionString("ExamServerConnection"));
      });
      //注入实体操作接口与实现类的注入
      services.AddScoped<IRepositoryWrapper,RepositoryWrapper>();
      //添加AutoMapper服务
      services.AddAutoMapper(typeof(Startup));
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILogger<Startup> logger) //添加日志记录
    {
      if (env.IsDevelopment())
      {
        logger.LogInformation("In Development environment"); //日志输出
        app.UseDeveloperExceptionPage();
      }
      app.UseHttpsRedirection();
      //使用Swagger中间件
      app.UseSwagger();
      app.UseSwaggerUI(options=>{
        options.SwaggerEndpoint("/swagger/v1/swagger.json", "ExamServer API V1");
      });

      app.UseRouting();
      app.UseCors("any");
      app.UseAuthorization();

      //中间件
      app.UseEndpoints(endpoints =>
      {
        endpoints.MapControllers();
      });

    }
  }
}
